MFC: warning C4244: “参数”: 从“double”转换到“float”，可能丢失数据

于 2021-11-18 14:17:51 发布
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分类专栏： MFC 文章标签： 数据库 database mfc
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本文链接：https://blog.youkuaiyun.com/wowocpp/article/details/121399718
本文介绍如何在stdafx.h文件中通过添加#pragma warning(disable:4244)来禁用特定的编译器警告。这有助于减少编译时的警告信息，但可能会影响代码质量。若项目不涉及大量数据转换，此方法较为适用。

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stdafx.h 文件中:

增加一行代码即可过滤此提示：

#pragma warning(disable:4244)

重新编译即可，但是有时候不建议去除这个，
有这个提示有利于写好代码，
当然如果整个工程里面不会涉及大数据，
过滤掉这个提示基本没问题

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找到stdafx.h 增加一行代码即可过滤此提示： #pragma warning(disable:4244) 重新编译即可，但是有时候不建议去除这个，有这个提示有利于写好代码，当然如果整个工程里面不会涉及大数据，过滤掉这个提示基本没问题 ...
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Windows PowerShell 版权所有（C） Microsoft Corporation。保留所有权利。 安装最新的 PowerShell，了解新功能和改进！https://aka.ms/PSWindows PS F:\pythonten\project> cl 用于 x64 的 Microsoft (R) C/C++ 优化编译器 19.44.35209 版 版权所有(C) Microsoft Corporation。保留所有权利。 用法: cl [ 选项... ] 文件名... [ /link 链接选项... ] PS F:\pythonten\project> pip install mnnpy -i https://pypi.tuna.tsinghua.edu.cn/simple/ Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple/ Collecting mnnpy Using cached https://pypi.tuna.tsinghua.edu.cn/packages/c2/6e/e8f963203e552d80a04adf80b19ecb248fa949b3db7a6fc935a2f49e8454/mnnpy-0.1.9.5.tar.gz (117 kB) Installing build dependencies ... done Getting requirements to build wheel ... done Preparing metadata (pyproject.toml) ... done Requirement already satisfied: numpy in f:\pythonten\python310\lib\site-packages (from mnnpy) (1.26.3) Requirement already satisfied: scipy in f:\pythonten\python310\lib\site-packages (from mnnpy) (1.12.0) Requirement already satisfied: anndata in f:\pythonten\python310\lib\site-packages (from mnnpy) (0.9.2) Requirement already satisfied: pandas in f:\pythonten\python310\lib\site-packages (from mnnpy) (2.2.0) Requirement already satisfied: numba in f:\pythonten\python310\lib\site-packages (from mnnpy) (0.58.1) Requirement already satisfied: h5py>=3 in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (3.10.0) Requirement already satisfied: natsort in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (8.4.0) Requirement already satisfied: packaging>=20 in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (23.2) Requirement already satisfied: python-dateutil>=2.8.2 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2.8.2) Requirement already satisfied: pytz>=2020.1 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2023.3.post1) Requirement already satisfied: tzdata>=2022.7 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2023.4) Requirement already satisfied: six>=1.5 in f:\pythonten\python310\lib\site-packages (from python-dateutil>=2.8.2->pandas->mnnpy) (1.16.0) Requirement already satisfied: llvmlite<0.42,>=0.41.0dev0 in f:\pythonten\python310\lib\site-packages (from numba->mnnpy) (0.41.1) Building wheels for collected packages: mnnpy Building wheel for mnnpy (pyproject.toml) ... error error: subprocess-exited-with-error × Building wheel for mnnpy (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> [73 lines of output] C:\Users\Lenovo\AppData\Local\Temp\pip-build-env-2jqu8z5o\overlay\Lib\site-packages\setuptools\dist.py:599: SetuptoolsDeprecationWarning: Invalid dash-separated key 'python-tag' in 'bdist_wheel' (setup.cfg), please use the underscore name 'python_tag' instead. !! ******************************************************************************** Usage of dash-separated 'python-tag' will not be supported in future versions. Please use the underscore name 'python_tag' instead. (Affected: mnnpy). By 2026-Mar-03, you need to update your project and remove deprecated calls or your builds will no longer be supported. See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html for details. ******************************************************************************** !! opt = self._enforce_underscore(opt, section) C:\Users\Lenovo\AppData\Local\Temp\pip-build-env-2jqu8z5o\overlay\Lib\site-packages\setuptools\dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated. !! ******************************************************************************** Please consider removing the following classifiers in favor of a SPDX license expression: License :: OSI Approved :: BSD License See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details. ******************************************************************************** !! self._finalize_license_expression() Building with c. running bdist_wheel running build running build_py file irlb.py (for module irlb) not found file mnn.py (for module mnn) not found file utils.py (for module utils) not found creating build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\irlb.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\mnn.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\settings.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\utils.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\__init__.py -> build\lib.win-amd64-cpython-310\mnnpy file irlb.py (for module irlb) not found file mnn.py (for module mnn) not found file utils.py (for module utils) not found running build_ext building 'mnnpy._utils' extension creating build\temp.win-amd64-cpython-310\Release\mnnpy "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\bin\HostX86\x64\cl.exe" /c /nologo /O2 /W3 /GL /DNDEBUG /MD -IF:\pythonten\python310\include -IF:\pythonten\python310 \Include "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\include" "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\ATLMFC\include" "- IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\VS\include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0 .26100.0\\um" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\shared" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\winrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\cppwinrt" /Tcmnnpy/_utils.c /Fobuild\temp.win-amd64-cpython-310\Release\mnnpy\_utils.obj -O2 -ffast-math -march=native -fopenmp cl: 命令行 warning D9002 :忽略未知选项“-ffast-math” cl: 命令行 warning D9002 :忽略未知选项“-march=native” cl: 命令行 warning D9002 :忽略未知选项“-fopenmp” _utils.c mnnpy/_utils.c(2117): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(2359): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(2576): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(16475): error C2105: “++”需要左值 mnnpy/_utils.c(16477): error C2105: “--”需要左值 mnnpy/_utils.c(16764): error C2105: “++”需要左值 mnnpy/_utils.c(16766): error C2105: “--”需要左值 mnnpy/_utils.c(17003): error C2105: “++”需要左值 mnnpy/_utils.c(17005): error C2105: “--”需要左值 mnnpy/_utils.c(17615): warning C4996: 'PyEval_InitThreads': deprecated in 3.9 mnnpy/_utils.c(17674): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17679): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17694): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17707): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(19372): warning C4996: 'PyUnicode_FromUnicode': deprecated in 3.3 error: command 'C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for mnnpy Failed to build mnnpy ERROR: Failed to build installable wheels for some pyproject.toml based projects (mnnpy) PS F:\pythonten\project> pip install mnnpy Collecting mnnpy Using cached mnnpy-0.1.9.5.tar.gz (117 kB) Installing build dependencies ... done Getting requirements to build wheel ... done Preparing metadata (pyproject.toml) ... done Requirement already satisfied: numpy in f:\pythonten\python310\lib\site-packages (from mnnpy) (1.26.3) Requirement already satisfied: scipy in f:\pythonten\python310\lib\site-packages (from mnnpy) (1.12.0) Requirement already satisfied: anndata in f:\pythonten\python310\lib\site-packages (from mnnpy) (0.9.2) Requirement already satisfied: pandas in f:\pythonten\python310\lib\site-packages (from mnnpy) (2.2.0) Requirement already satisfied: numba in f:\pythonten\python310\lib\site-packages (from mnnpy) (0.58.1) Requirement already satisfied: h5py>=3 in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (3.10.0) Requirement already satisfied: natsort in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (8.4.0) Requirement already satisfied: packaging>=20 in f:\pythonten\python310\lib\site-packages (from anndata->mnnpy) (23.2) Requirement already satisfied: python-dateutil>=2.8.2 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2.8.2) Requirement already satisfied: pytz>=2020.1 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2023.3.post1) Requirement already satisfied: tzdata>=2022.7 in f:\pythonten\python310\lib\site-packages (from pandas->mnnpy) (2023.4) Requirement already satisfied: six>=1.5 in f:\pythonten\python310\lib\site-packages (from python-dateutil>=2.8.2->pandas->mnnpy) (1.16.0) Requirement already satisfied: llvmlite<0.42,>=0.41.0dev0 in f:\pythonten\python310\lib\site-packages (from numba->mnnpy) (0.41.1) Building wheels for collected packages: mnnpy Building wheel for mnnpy (pyproject.toml) ... error error: subprocess-exited-with-error × Building wheel for mnnpy (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> [73 lines of output] C:\Users\Lenovo\AppData\Local\Temp\pip-build-env-sra4z_m5\overlay\Lib\site-packages\setuptools\dist.py:599: SetuptoolsDeprecationWarning: Invalid dash-separated key 'python-tag' in 'bdist_wheel' (setup.cfg), please use the underscore name 'python_tag' instead. !! ******************************************************************************** Usage of dash-separated 'python-tag' will not be supported in future versions. Please use the underscore name 'python_tag' instead. (Affected: mnnpy). By 2026-Mar-03, you need to update your project and remove deprecated calls or your builds will no longer be supported. See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html for details. ******************************************************************************** !! opt = self._enforce_underscore(opt, section) C:\Users\Lenovo\AppData\Local\Temp\pip-build-env-sra4z_m5\overlay\Lib\site-packages\setuptools\dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated. !! ******************************************************************************** Please consider removing the following classifiers in favor of a SPDX license expression: License :: OSI Approved :: BSD License See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details. ******************************************************************************** !! self._finalize_license_expression() Building with c. running bdist_wheel running build running build_py file irlb.py (for module irlb) not found file mnn.py (for module mnn) not found file utils.py (for module utils) not found creating build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\irlb.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\mnn.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\settings.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\utils.py -> build\lib.win-amd64-cpython-310\mnnpy copying mnnpy\__init__.py -> build\lib.win-amd64-cpython-310\mnnpy file irlb.py (for module irlb) not found file mnn.py (for module mnn) not found file utils.py (for module utils) not found running build_ext building 'mnnpy._utils' extension creating build\temp.win-amd64-cpython-310\Release\mnnpy "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\bin\HostX86\x64\cl.exe" /c /nologo /O2 /W3 /GL /DNDEBUG /MD -IF:\pythonten\python310\include -IF:\pythonten\python310 \Include "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\include" "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\ATLMFC\include" "- IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\VS\include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0 .26100.0\\um" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\shared" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\winrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\cppwinrt" /Tcmnnpy/_utils.c /Fobuild\temp.win-amd64-cpython-310\Release\mnnpy\_utils.obj -O2 -ffast-math -march=native -fopenmp cl: 命令行 warning D9002 :忽略未知选项“-ffast-math” cl: 命令行 warning D9002 :忽略未知选项“-march=native” cl: 命令行 warning D9002 :忽略未知选项“-fopenmp” _utils.c mnnpy/_utils.c(2117): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(2359): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(2576): warning C4244: “=”: 从“double”转换到“float”，可能丢失数据 mnnpy/_utils.c(16475): error C2105: “++”需要左值 mnnpy/_utils.c(16477): error C2105: “--”需要左值 mnnpy/_utils.c(16764): error C2105: “++”需要左值 mnnpy/_utils.c(16766): error C2105: “--”需要左值 mnnpy/_utils.c(17003): error C2105: “++”需要左值 mnnpy/_utils.c(17005): error C2105: “--”需要左值 mnnpy/_utils.c(17615): warning C4996: 'PyEval_InitThreads': deprecated in 3.9 mnnpy/_utils.c(17674): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17679): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17694): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(17707): error C2039: "tp_print": 不是 "_typeobject" 的成员 F:\pythonten\python310\include\cpython/object.h(191): note: 参见“_typeobject”的声明 mnnpy/_utils.c(19372): warning C4996: 'PyUnicode_FromUnicode': deprecated in 3.3 error: command 'C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for mnnpy Failed to build mnnpy ERROR: Failed to build installable wheels for some pyproject.toml based projects (mnnpy)
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warning C4244: “=”: 从“ULONGLONG”转换到“DWORD”，可能丢失数据 分析：            m_nTotalBytes = m_File.GetLength(); m_File.GetLength();返回的是ULONGLONG, 而m_nTotalBytes, 是DWORD  ,不匹配。 ULONGLONG是64位的，DWORD是32位的
warning C4244: “初始化”: 从“double”转换到“int”，可能丢失数据 警告
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c语言问题0我是新手，我遇到了一个问题，希望大家指点一二啊！下面是程序代码：#include#include#include#define B 1000#define N 1000#define A 100void bsample(); /*函数声明*/void sort();main(){double X[N],X0,S0=0;int i,j,m=0,S=0; /*从U[0，1]中随机产生...
warning C4244: '=' : conversion from 'int' to 'float', possible loss of data
hi
05-04 1万+
在32位平台上，通常int是4字节长度，最多表示到21亿多，而int型是“绝对精确”的，换句话说，就是int行最多可以保证10位十进制有效数字的精确度。 而float只能保证6位有效数字的精确度，因此int到float的转换是可能丢失精度的，比如整数“1234567899”转换成float后，大约是：1.23457936乘10的9次方，也就是从第7位有效数字开始已经不准确了。 do
关于VS “ 警告 C4244 “参数”: 从“time_t”转换到“unsigned int”，可能丢失数据 ”的解决方法
土豆大叔的博客
01-19 8293
关于VS “ 警告 C4244 “参数”: 从“time_t”转换到“unsigned int”，可能丢失数据 ”的解决方法
C++ warning
fenhong91的博客
02-06 3311
1. Compiler Warning(level 1) C4482: nonstandard extension used: enum 'enum' used in qualified name.当在一个类型中指定了枚举类型时，你指定变量名称的时候不需要加枚举名。 if(rythtoken->getKeyType()==KEYLENGHTYPE::RYTH_LONG)  // war
warning C4244: “=”: 从“long”转换到“float”，可能丢失数据
冰原噬夜的博客
03-01 4199
确认数据类型是否正确。 若正确，可使用强制类型转换，消除警告。
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