Question

我编写C++调用MessageBox是报错，还请各位多多帮助！

#include<windows.h>

__stdcall WinMain(HINSTANCE hinstance,HINSTANCE jprevinstance,LPSTR lpComLine,int nCmdShow)
{
typedef (WINAPI *lpMessageBox)(HWND hWnd,LPCTSTR lpText,LPCTSTR lpCaption,UINT uType);
HINSTANCE hDll;
hDll = LoadLibrary("user32.dll");
lpMessageBox Msg;

Msg = (lpMessageBox) GetProcAddress(hDll,'MessageBoxA');

// Msg(NULL,TEXT("开始学Window编程!"),TEXT("消息!"),MB_OK);　　

return 0;
}

C:\new_temp\新建文件夹\MessageBox\Cpp2.cpp(10) : error C2015: too many characters in constant

Answer 1

Msg = (lpMessageBox) GetProcAddress(hDll,'MessageBoxA');
第二个参数有问题，第二个参数为LPCSTR，改成
Msg = (lpMessageBox) GetProcAddress(hDll,"MessageBoxA");

Answer 2

你用的是字符‘’所以会报错，试试“MessageBoxA”或者_T("MessageBoxA")