__int64的printf问题！(转：http://blog.chinaunix.net/u/19782/showart_403061.html)

最新推荐文章于 2021-12-11 16:31:07 发布

Wangqis

最新推荐文章于 2021-12-11 16:31:07 发布

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本文介绍了一种跨平台(__int64)输出的方法，适用于Windows和Linux环境。通过预处理指令定义不同类型的整数，并使用特定的格式字符串来解决不同平台间的输出差异。

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__int64的printf问题！

把Linux的东西移植到Windows 下，问题真是多，有时候感觉很是奇怪！今天有遇到了一个！

__int64在Windows下怎么输出的问题？我还以为是强制转换的时候出问题了，查了好长时间！

下面是测试代码，已经通过Windws, Linux两个平台的测试了！

# include < stdio. h> # ifdef _WIN32 typedef unsigned __int64 uint64_t ; # else typedef unsigned long long uint64_t ; # endif typedef unsigned int uint32_t ; typedef unsigned short uint16_t ; typedef unsigned char uint8_t ; int main( int argc, char * argv[ ] ) { uint32_t t321, t322, t323; uint64_t t641, t642, t643; uint8_t * p; uint8_t t[ 64] = { 0x4E, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x4E, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00 } ; printf ( "sizeof(uint64_t) = %d/n" "sizeof(uint32_t) = %d/n" , sizeof ( uint64_t ) , sizeof ( uint32_t ) ) ; p = t; t321 = * ( uint32_t * ) p; p + = 6; t322 = * ( uint32_t * ) p; p + = 6; t323 = * ( uint32_t * ) p; p + = 6; printf ( "t321[%X].%d t322[%X].%d t323[%X].%d/n" , t321, t321, t322, t322, t323, t323) ; p = t; t641 = * ( uint32_t * ) p; p + = 6; t642 = * ( uint32_t * ) p; p + = 6; t643 = * ( uint32_t * ) p; p + = 6; # ifdef _WIN32 printf ( "t641[%I64X].%I64d t642[%I64X].%I64d t643[%I64X].%I64d/n" , t641, t641, t642, t642, t643, t643) ; # else printf ( "t641[%llX].%lld t642[%llX].%lld t643[%llX].%lld/n" , t641, t641, t642, t642, t643, t643) ; # endif t641 = 0x1122334455667788; # ifdef _WIN32 printf ( "%I64X %I64d /n" , t641, t641) ; # else printf ( "%llX %lld /n" , t641, t641) ; # endif return 0; }

/* Test Env: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86 Microsoft Windows 2000 [Version 5.00.2195] Result: sizeof(uint64_t) = 8 sizeof(uint32_t) = 4 t321[7C4E].31822 t322[7C4E].31822 t323[4].4 t641[7C4E].31822 t642[7C4E].31822 t643[4].4 1122334455667788 1234605616436508552 -------------------------------------- Test Env: gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-47.3) Result: sizeof(uint64_t) = 8 sizeof(uint32_t) = 4 t321[7C4E].31822 t322[7C4E].31822 t323[4].4 t641[7C4E].31822 t642[7C4E].31822 t643[4].4 1122334455667788 1234605616436508552 */ 在进行移植的时候可能用的上的： #ifdef _WIN32 # define APR_UINT64_T_HEX_FMT "llx" #else # define APR_UINT64_T_HEX_FMT "I64x" #endif example: sprintf(buf, "%" APR_UINT64_T_HEX_FMT, var); #define HOST_WIDEST_INT_PRINT_DEC "%I64d" #define HOST_WIDEST_INT_PRINT_UNSIGNED "%I64u" #define HOST_WIDEST_INT_PRINT_HEX "0x%I64x"