从“DWORD”到“const char *”的转换无效 [英] Invalid conversion from 'DWORD' to 'const char *'

问题描述

我试图编译一些代码，但我收到一个错误：

I'm trying to compile some code, but I'm getting an error:

错误从 DWORD 至 const char *

这里是我试图编译的代码：

Here's the code I'm trying to compile:

hWindow = FindWindow(NULL, "Window");    
if (hWindow){
    GetWindowThreadProcessId(hWindow, &pid);
}
hProcess = OpenProcess(PROCESS_ALL_ACCESS, 0, pid);
if(hProcess != NULL) {
    SetWindowText(GetDlgItem(MyWindow, MyStatic), pid);
}

如何转换 DWORD 到 const char * ？

推荐答案

SetWindowText(GetDlgItem(MyWindow, MyStatic), pid);

pid 它在 GetWindowThreadProcessId（hWindow，& pid）它接受 LPDWORD 作为第二个参数）。然而， SetWindowText 需要一个C字符串作为它的第二个参数，所以代替 pid ，你必须传递一个值类型 char * 或 char [] 。

pid is a DWORD (as you used it in GetWindowThreadProcessId(hWindow, &pid) which takes a LPDWORD as the second argument). However, SetWindowText expects a C-string as it's second argument, so instead of pid, you must pass a value of type char * or char [].

显示 pid 的值，您可以使用 sprintf ：

To display the value of pid, you can make use of sprintf:

char * str = new char[10];
sprintf(str,"%d",pid);

您可能需要修改 str 一点（10可能太小，或大于必要 - 这取决于你和你的情况）。

You may have to modify the size of str a little (10 might be too small, or bigger than necessary - that's up to you and your situation).

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