c语言的一处陷阱:

#include 
  
   

// test.c 用Unicode方式编译崩溃
void main()
{
	STARTUPINFO si;
	PROCESS_INFORMATION pi;

	ZeroMemory( &si, sizeof(si) );
	si.cb = sizeof(si);
	ZeroMemory( &pi, sizeof(pi) );

	if( !CreateProcess( NULL,   // No module name (use command line)
		"calc.exe",        // Command line
		NULL,           // Process handle not inheritable
		NULL,           // Thread handle not inheritable
		FALSE,          // Set handle inheritance to FALSE
		0,              // No creation flags
		NULL,           // Use parent's environment block
		NULL,           // Use parent's starting directory 
		&si,            // Pointer to STARTUPINFO structure
		&pi )           // Pointer to PROCESS_INFORMATION structure
		) 
	WaitForSingleObject( pi.hProcess, INFINITE );

	// Close process and thread handles. 
	CloseHandle( pi.hProcess );
	CloseHandle( pi.hThread );
}
  

以上代码用unicode方式c编译可以通过,运行时崩溃,编译器会报个警告,儿非错误

test.c(13) : warning C4133: 'function' : incompatible types - from 'char [9]' to 'LPWSTR'

CreateProcessW 的第二个参数要去是LPWSTR ,这里被强制转换了而c++方式编译的话会报错,直接编译不过

test.cpp(21) : error C2664: 'CreateProcessW' : cannot convert parameter 2 from 'const char [9]' to 'LPWSTR'