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wchar_t *str = "Just for Test";
DebugString(L"Test : %s", str) //输出窗口正确输出调试信息
MYTRACE(L"Test : %s", str); //这样程序会崩掉
#ifdef _DEBUG
#define MYTRACE(sz) DebugString(sz)
#else
#define MYTRACE(sz)
#endif
void DebugString(const wchar_t *format, ...);
#pragma warning(disable:4996)
const UINT DEBUG_BUFFER_SIZE = 1024;
void DebugString(const wchar_t *format, ...)
{
va_list arglist;
wchar_t buffer[DEBUG_BUFFER_SIZE];
va_start(arglist, format);
_vsnwprintf(buffer, DEBUG_BUFFER_SIZE, format, arglist);
va_end(arglist);
_tcsncat(buffer, _T("\n"), 1);
OutputDebugString(buffer);
}
#pragma warning(pop)
#ifdef _DEBUG
#define MYTRACE(s, ...) DebugString(s, __VA_ARGS__)
#else
#define MYTRACE(s, ...)
#endif
void DebugString(const wchar_t *format, ...);
#pragma warning(disable:4996)
const unsigned int DEBUG_BUFFER_SIZE = 1024;
void DebugString(const wchar_t *format, ...)
{
va_list arglist;
wchar_t buffer[DEBUG_BUFFER_SIZE];
va_start(arglist, format);
_vsnwprintf(buffer, DEBUG_BUFFER_SIZE, format, arglist);
va_end(arglist);
_tcsncat(buffer, _T("\n"), 1);
OutputDebugString(buffer);
}
#pragma warning(pop)
// variadic_macros.cpp
#include <stdio.h>
#define EMPTY
#define CHECK1(x, ...) if (!(x)) { printf(__VA_ARGS__); }
#define CHECK2(x, ...) if ((x)) { printf(__VA_ARGS__); }
#define CHECK3(...) { printf(__VA_ARGS__); }
#define MACRO(s, ...) printf(s, __VA_ARGS__)
int main() {
CHECK1(0, "here %s %s %s", "are", "some", "varargs1(1)\n");
CHECK1(1, "here %s %s %s", "are", "some", "varargs1(2)\n"); // won't print
CHECK2(0, "here %s %s %s", "are", "some", "varargs2(3)\n"); // won't print
CHECK2(1, "here %s %s %s", "are", "some", "varargs2(4)\n");
// always invokes printf in the macro
CHECK3("here %s %s %s", "are", "some", "varargs3(5)\n");
MACRO("hello, world\n");
// MACRO("error\n", EMPTY); would cause C2059
}
#ifdef _DEBUG
#define MYTRACE(s, ...) DebugString(s, __VA_ARGS__)
#else
#define MYTRACE(s, ...)
#endif
void WINAPI DebugString(const wchar_t *format, ...);
#pragma warning(disable:4996)
const unsigned int DEBUG_BUFFER_SIZE = 1024;
void WINAPI DebugString(const wchar_t *format, ...)
{
va_list arglist;
wchar_t buffer[DEBUG_BUFFER_SIZE];
va_start(arglist, format);
_vsnwprintf(buffer, DEBUG_BUFFER_SIZE, format, arglist);
va_end(arglist);
_tcsncat(buffer, _T("\n"), 1);
OutputDebugString(buffer);
}
#pragma warning(pop)